Wireless and Personal Communications Systems - MCQs in Electronics

This is the Multiple Choice Questions (MCQs) in Chapter 32: Wireless and Personal Communications Systems from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

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1. A network that employs one powerful central computer and several PCs is called:

• A. A wireless network.
• B. A local-area network.
• C. A client-server network.
• D. A peer-to-peer network.

2. Infrared and optical wireless links work best:

• A. Over distances exceeding 1000 miles.
• B. On a line of sight.
• C. At low radio frequencies.
• D. In situations with high levels of noise.

3. Which of the following devices or systems is not generally considered wireless?

• A. A remote-control garage-door opener.
• B. An amateur radio station.
• C. A beeper/pager.
• D. A telephone set that requires a wall jack.

4. A noise blanker can improve the quality of:

• A. Radio reception.
• B. Radio transmission.
• C. Infrared reception.
• D. Infrared transmission.

5. In the United States, a license is required for:

• A. Receiving on amateur-radio frequencies.
• B. Transmitting on amateur-radio frequencies.
• C. Using infrared wireless devices.
• D. Using a wireless automobile security system.

6. Noise in a wireless receiver can be minimized by:

• A. Raising the temperature to very high values.
• B. Reducing the temperature to very low values.
• C. Maximizing the amplification.
• D. Minimizing the relative humidity.

7. As the data speed increases in a wireless system, all other factors being equal:

• A. The signal bandwidth increases.
• B. The signal bandwidth decreases.
• C. The overall noise level increases.
• D. The overall noise level decreases.

8. The term shortwave, in reference to radio, refers to signals having

wavelengths of approximately:

• A. 10 to 100 millimeters.
• B. 100 millimeters to 1 meter.
• C. 1 to 10 meters.
• D. 10 to 100 meters.

9. In general, as the noise level in a wireless system increases:

• A. Stronger incoming signals are needed to overcome it.
• B. Weaker signals can be received.
• C. The temperature of the system rises.
• D. The bandwidth of the system increases.

10. In a spectrum analyzer, the horizontal axis shows:

• A. Voltage.
• B. Power.
• C. Frequency.
• D. Time.

11. A device consisting of a receiver and transmitter in the same box is called a:

• A. Modem.
• B. Transverter.
• C. Transceiver.
• D. Transponder.

12. The use of direction-finding equipment to determine the latitude and longitude of a radio transmitter is an example of:

• A. Radiolocation.
• B. IR wireless.
• C. The Global Positioning System.
• D. Packet radio.

13. A LAN in which each user’s computer stores its own data is called:

• A. A wireless LAN.
• B. A wide-area LAN.
• C. LAN topology.
• D. A peer-to-peer LAN.

14. Which of the following constitutes illegal use of ham radio?

• A. Selling cars by broadcasting prices to other hams.
• B. Talking about the weather and exchanging local forecasts.
• C. Talking about who might be the next president of the United States.
• D. Connecting a radio to the Internet.

15. An electromagnetic wave can be considered to fall in the shortwave band if its free-space wavelength is:

• A. 55 kilometers.
• B. 55 meters.
• C. 55 centimeters.
• D. 55 millimeters.

16. In a cellular network, a base station is sometimes called a:

• A. Transceiver.
• B. Cell.
• C. Repeater.
• D. Cell phone.

17. An advantage of conventional hard-wired telephone over cellular is:

• A. Privacy.
• B. Portability.
• C. Ease of use in a car.
• D. LAN topology.

18. An advantage of cellular over conventional hard-wired telephone is:

• A. Security.
• B. Lower cost.
• C. Mobility.
• D. Data speed.

19. Infrared waves are:

• A. Longer than radio waves.
• B. Longer than visible-light waves.
• C. Shorter than visible-light waves.
• D. Inaccurately named; they are really heat rays.

20. The GPS might be useful:

• A. For improving the performance of a LAN.
• B. For increasing the data speed in a wireless system.
• C. For minimizing noise in a wireless system.
• D. To a motorist who is lost.

Complete List of Multiple Choice Questions from this Book

Multiple Choice Questions in Teach Yourself Electricity and Electronics

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Answers key in Wireless and Personal Communications Systems

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